PROBLEM TO BE SOLVED: To provide a negative pressure booster comprising a reaction mechanism 24 comprising: a reaction piston 17 moving forward and backward by reacting an input rod 20 in a valve cylinder 10; an operation piston 15 provided on the valve cylinder 10 in a forward projecting state so as to surround the reaction piston; a cup-shaped output piston 21 continuous to a rear end of an output rod 25 facing a negative pressure chamber 2, and fitted to the valve cylinder 10 so as to slide forward and backward freely; and an elastic piston 22 stored in the output piston, whose front face faces the output piston 21, and whose rear face faces front faces of the reaction piston 17 and operation piston 15, in which even when the valve cylinder 10 is slightly inclined to the output piston 21 in a non-operation state of the negative pressure booster, seal property of a contact part between a front end face 15f of the operation piston and elastic piston 22 is enhanced.SOLUTION: An inner peripheral end 15fie, or a predetermined inner peripheral side area 15fi including the inner peripheral end 15fie protrudes toward an elastic piston 22 side relative to other areas 15fo, on a front end face 15f of an operation piston 15.

    【課題】 弁筒10内で入力杆20に連動して前後動する反力ピストン17と、この反力ピストンを囲繞するよう弁筒10に前向きに突設される作動ピストン15と、負圧室2に臨む出力杆25の後端に連なり且つ弁筒10に前後摺動可能に嵌合されるカップ状の出力ピストン21と、その出力ピストン内に収納されて前面が出力ピストン21に、また後面が反力ピストン17及び作動ピストン15の前端面にそれぞれ対向する弾性ピストン22とを備える反力機構24を含む負圧ブースタにおいて、負圧ブースタの非作動状態で弁筒10が出力ピストン21に対し僅かに傾いても、作動ピストン前端面15fと弾性ピストン22間の当接部のシール性を効果的に高める。【解決手段】 作動ピストン15の前端面15fのうち、その内周端15fie、又は該内周端15fieを含む所定の内周側領域15fiが、その他の領域15foよりも弾性ピストン22側に張出すように形成される。【選択図】 図2


    Access

    Download


    Export, share and cite



    Title :

    NEGATIVE PRESSURE BOOSTER


    Additional title:

    負圧ブースタ


    Contributors:

    Publication date :

    2015-12-10


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B60T Bremsanlagen für Fahrzeuge oder Teile davon , VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF



    NEGATIVE PRESSURE BOOSTER

    YATABE SHUICHI | European Patent Office | 2015

    Free access

    NEGATIVE-PRESSURE BOOSTER

    SUZUKI KIMIYASU | European Patent Office | 2017

    Free access

    NEGATIVE PRESSURE BOOSTER

    TANIZAWA KIYOAKI | European Patent Office | 2021

    Free access

    NEGATIVE PRESSURE BOOSTER

    MIZUTANI KAZUHIRO | European Patent Office | 2021

    Free access

    NEGATIVE PRESSURE TYPE BOOSTER

    AWAJI MASAHIRO | European Patent Office | 2020

    Free access